Macc Cuill (Manx Maughold) bishop 489 d.498
Feast day April 25 (Farmer quotes April 27)
Kneen quotes Nov 15 (from Machud Episcopus in
'Martyrology of Donegal') which was known in Manx as
Laa'l Maghald geuree Maughold's winter feast day and
August 11th as Laa'l Maghald toshee Maugholds first
feast day. On both days fairs were held in Maughold.
The April feast day may be a result of confusion with St
Machalus who in the Scottish Calendar had this feast day and
of whom was stated 'He is called also Machella and Mauchold.
He sat bishop in AD 498 and 518'.
According to Farmer nothing is known about him except the
legend that he was a robber from Druimm moccu Echach in
Ulster, converted by St Patrick. It is likely that this
story (possibly elaborated from existing Ulster legends) was
due to Jocelin, of Furness Abbey, in his life of St Patrick
written c1185 mainly to please John de Courci, Anglo-Norman
conqueror of Ulster and brother in law to the King of
Mann.

Demsey gives a vivid account of the Manx legend that Mac
Cuill, feigning sickness to deceive St Patrick was actually
found to be dead by his companions and had life breathed
back into him by St Patrick. On Mac Cuill's instant
conversion Patrick required that he depart alone in a small
boat, with no provisions and upon reaching land was to
fetter his feet and throw away the key. Following these
instructions Mac Cuill reached Mann and being received by
the original bishops Coniunri and Romul welcomed him and
after examination found his conversion genuine. He was
eventually raised to holy orders and after the miraculous
discovery, in the belly of a fish, of the key to his fetters
was ordained and appointed bishop on the death of his
benefactors. A somewhat less reverent retelling is given in
Mona
Miscellany p220

References

J.J.Kneen
The Place-Names of the Isle of Man
Douglas: Yn Cheshaght Ghailckagh (The Manx Society) 1925-
Republished 1970
Olaf Kolsrud
The Celtic Bishops in the Isle of Man, the Hebrides and
Orkney
Zeitschrift fur Celtic Philologie IX pp357/79 1913
D.H.Farmer
The Oxford Dictionary of Saints 1978
William S
Demsey,. History of the Catholic Church in the Isle of Man
Wigan: Birchly Hall Press 1958